Arhivă — Seria C

1

Piecewise linear approximation of logarithmic image processing models for dynamic range enhancement

Corneliu Florea, Constantin Vertan

It has been proven that Logarithmic Image Processing (LIP) models provide\r\na suitable framework for visualizing and enhancing digital images acquired by\r\nvarious sources. The underlying initial reason for derivation of such models has\r\nbeen the necessity to deal with multiplicative phenomena. Later, it has been p…

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2

A method for real-time emulation of genetic algorithm-optimized controllers

Nicolae Necula

This paper describes a Genetic Programming (GP)-based approach for the\r\nreverse engineering of Genetic Algorithm (GA)-optimized controllers, allowing the\r\ndesigner to emulate and implement in real-time the behavior of such controllers.\r\nThe method is illustrated by the experimental results generated in the Matlab…

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3

WiMAX 802.16 network – secure communications

Cãtãlin-Teodor Dogaru, Teodor Petrescu

“Worldwide Interoperability for Microwave Access” (WiMAX) represents\r\none of the most important technologies of the moment when we are talking about\r\nproviding Broadband Internet using wireless connections. As a wireless protocol,\r\nWiMAX has an additional set of security threats not faced in cable systems. Becaus…

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4

Microcontroller-based electronic module for controlling mechatronic systems

Andrei Drumea, Paul Svasta

The paper presents design and implementation of a single chip electronic\r\nmodule for industrial control based on 16 bit RISC microcontroller with large\r\nresources of memory and peripherals. The module was tested and special software\r\nwas developed for a mechatronic application - an electro hydraulic position cont…

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5

Lossless compression tool for limited number of colors

Radu Rãdescu

The objective of the ICompress tool is to study the compression behavior in\r\nreal situations with large data sequences for images with limited number of colors.\r\nBecause the existing standards do not offer enough flexibility, and the\r\nimplementation of some compression and decompression routines for these\r\nstan…

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6

Simulation of Fresnel lenses and binary phase gratings with beam propagation method

Mihai Kusko, Dana Cristea, Paul ªchiopu

In this paper are presented the simulation results obtained with BPM Beam\r\nPropagation Method regarding two types of diffractive optical elements: Fresnel\r\nlenses and binary phase gratings. A comparison has been done between theoretical\r\nresults and the results obtained by simulation in order to obtain the optima…

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7

Impact of using upper layers security techniques in Ad Hoc wireless networks

Jalal Frihat, Florica Moldoveanu, Alin Moldoveanu

Ad hoc networks are a new wireless networking technology. They have\r\ntremendous usage in commercial applications. One main challenge in design of ad\r\nhoc networks is their vulnerability to various security attacks.\r\nIn this paper, we analyze the threats on ad hoc network faces and the security\r\ngoals to be achi…

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8

On-line analytical mining for advanced business intelligence solution

Marius Guran, Aref Mehanna, Bilal Hussein

Data mining (DM) deals with the proactive process of searching and\r\ndiscovering the patterns in the data and present it in a more predictable and\r\nuseful format. It discovers the hidden knowledge within the information which is\r\nnot possible with traditional relational or on-line analytical processing (OLAP)\r\nt…

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9

Feedback control systems synthesis by using the root locus

Florin Stratulat

Feedback control systems designing has the objective of fulfilling a series of\r\nperformance indexes of the dynamic and stationary regime: percent overshoot,\r\nsettling-time, steady-state error. In this article is presented a feedback control\r\nsystems designing procedure on the basis of the root locus. In order to …

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10

The control “by mathematical model” of a heat exchanger used for cooling the cracked gas in an ethylene technological unit

Marian Romeo Catana

The approach of the problems regarding the research, design and control in\r\nthe chemical technologies field with the help of the electronic calculation technique\r\nhas become for several years a characteristic feature of the work methodologies,\r\nand its efficiency is nowadays unquestionable. The numerical mathemat…

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11

The architecture of an expert measurement system for the dynamic modeling of the stock market

Dan Niþescu

In the research activity framework “Expert Measurement System for the\r\nDynamic Modeling of the Stock Market” I have been seeking the understanding and\r\nformalization of the stock market transactions [6] and to realize a Dynamic Model\r\nwhich implements that understanding. The transformation from Fractal Geometry\r…

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12

Human common wart removal: a FEM model for cryosurgery procedure

Sebastian Faur, Alexandru Morega

Common wart is a type of infection caused by a virus from the human\r\npapilloma virus (HPV) family. These benign tumors can be removed by medical\r\nprocedures like classic surgery methods, electrical cauterization, cryosurgery, and\r\nlaser surgery. This paper presents a model and numerical simulation results for\r\n…

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13

Analytical computation method for electrodynamic forces acting over electrical transformer windings

Ioan-Dragoº Deaconu, Aurel-Ionuþ Chirilã, Constantin Ghiþã, Valentin Nãvrãpescu, Gianfranco Chicco

Different methods are used at present to compute the short-circuit\r\nelectrodynamic forces exerted over the windings of three-phase electrical\r\ntransformers. Methods giving quite accurate results (e.g., the finite element method)\r\nrequire significant computing resources and computation time. Classical analytical\r…

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14

Experimental investigation on mass loss, ignition time and flame behaviour of biomass in HTAC furnaces

Ramona Dinu, Adrian Badea, Tiberiu Apostol, Cosmin Mãrculescu, Eduard Minciuc, Radu Kuncser

This paper outlines some of the key issues currently being debated regarding\r\nthe combustion of biomass material (wood pellets) within the high temperature air\r\ncombustion technologies (HTAC). An experimental study was performed in order to\r\nevaluate the combustion behavior when some process parameters were varie…

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15

Mechanical wear of automotive connectors during vibration tests

Rochdi El Abdi, Noureddine Benjemaa

Impact fretting of connectors was studied in the literature, but none of these\r\nstudies is completely satisfactory for finding the relation between the electrical\r\ncontact and wear rate.\r\nThe main objective of this work is to find and establish a correlation between\r\nwear, electrical behaviour and vibration str…

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16

Applying Petri net formalism in modeling of monthly test of valve from ecc system of CANDU 600 nuclear power plant

Marilena-Luminiþa Bedreagã, Basarab Guzun

For human reliability analysis, as part of probabilistic safety analysis, the\r\ninternational regulatory commission has developed the specific guides and\r\nprocedures to perform such assessment [1-2-3]. The paper presents the modality to\r\nperform human reliability quantification using Petri nets approach. This is a…

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